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A Sparks Middle School student cries and is comforted after being released from Agnes Risley Elementary School, where some students were evacuated to after a shooting at SMS in Sparks, Nev. on Monday, October 21, 2013 in Sparks, Nev. (AP Photo/Kevin Clifford)

A Sparks Middle School student, back to camera, cries with family members after being released from Agnes Risley Elementary School Monday Oct. 21, 2013, in Sparks Nev., after a shooting at Sparks Middle School. A student at the Sparks Middle School opened fire on campus, killing a staff member who was trying to protect other children, police said Monday. (AP Photo/Kevin Clifford)

Swat team members secure the scene near Sparks Middle School in Sparks, Nev., after a shooting there on Monday, Oct. 21, 2013. Authorities are reporting that two people were killed and two wounded at the Nevada middle school. (AP Photo/Kevin Clifford)

A Sparks Middle School student and her mother walk near Agnes Risley Elementary School, after students were evacuated to the school after a shooting at Sparks Middle School in Sparks, Nev. on Monday, Oct. 21, 2013, in Sparks, Nev. (AP Photo/Kevin Clifford)

A Sparks Middle School student cries with family members after being released from Agnes Risley Elementary School, where some students were evacuated to after a shooting at Sparks Middle School in Sparks, Nev. on Monday, Oct. 21, 2013 in Sparks, Nev. (AP Photo/Kevin Clifford)

Police secure the scene near Sparks Middle School after a shooting in Sparks, Nev., on Monday, Oct. 21, 2013. (AP Photo/Kevin Clifford)

In this photo provided by Jerry Davis, police gather near Sparks Middle School after a shooting at the school, Monday, Oct. 21, 2013, in Reno, Nev. (AP Photo/Jerry Davis)

A parent escorts his child from Agnes Risley Elementary school following a shooting at nearby Sparks Middle School October 21, 2013 in Sparks, Nevada. A staff member was killed and two students were injured after a student opened fire at the Nevada middle school. The suspected gunman was also killed. Students from the middle school were evacuated and held for parents at the elementary school. (Photo by David Calvert/Getty Images)

Law enforcement gather in the parking lot after a shooting at Sparks Middle School October 21, 2013 in Sparks, Nevada. A staff member was killed and two students were injured after a student opened fire at the Nevada middle school. The suspected gunman was also killed. (Photo by David Calvert/Getty Images)

Law enforcement gather in the parking lot after a shooting at Sparks Middle School October 21, 2013 in Sparks, Nevada. A staff member was killed and two students were injured after a student opened fire at the Nevada middle school. The suspected gunman was also killed. (Photo by David Calvert/Getty Images)

Police tape secures the scene after a shooting at Sparks Middle School October 21, 2013 in Sparks, Nevada. A staff member was killed and two students were injured after a student opened fire at the Nevada middle school. The suspected gunman was also killed. (Photo by David Calvert/Getty Images)

Parents escort a child from Agnes Risley Elementary school following a shooting at nearby Sparks Middle School October 21, 2013 in Sparks, Nevada. A staff member was killed and two students were injured after a student opened fire at the Nevada middle school. The suspected gunman was also killed. Students from the middle school were evacuated and held for parents at the elementary school. (Photo by David Calvert/Getty Images)

A parent escorts his children from Agnes Risley Elementary school following a shooting at nearby Sparks Middle School October 21, 2013 in Sparks, Nevada. (Photo by David Calvert/Getty Images)

A police officer stops traffic near Agnes Risley Elementary school following a shooting at nearby Sparks Middle School October 21, 2013 in Sparks, Nevada. (Photo by David Calvert/Getty Images)

A police officer walks to his vehicle after a shooting at Sparks Middle School October 21, 2013 in Sparks, Nevada. (Photo by David Calvert/Getty Images)

A parent escorts his child from Agnes Risley Elementary school following a shooting at nearby Sparks Middle School October 21, 2013 in Sparks, Nevada. (Photo by David Calvert/Getty Images)

Police are staged in front of Sparks Middle School after a shooting in Sparks, Nev. on Monday, Oct. 21, 2013 in Sparks, Nev. (AP Photo/Kevin Clifford)

Parents wait for officials to release their children from Agnes Risley Elementary School, where some students were evacuated to after a shooting at Sparks Middle School on Monday, Oct. 21, 2013 in Sparks, Nev. (AP Photo/Kevin Clifford)

Photos: Nevada middle school shooting – two killed, two wounded

SPARKS, Nev. (AP) -- Police in Sparks, Nevada, say the two people killed in a school shooting were a staff member and a student who was likely the attacker. Two other students were critically injured in the violence that erupted before classes began Monday. Authorities said the staff member was trying to intervene. Students from the Sparks Middle School and next door elementary school were evacuated to the nearby high school, and classes were canceled. Sparks is a city just east of Reno.